Twilio Labs Projects
Twimlets are small web applications that implement basic voice application functionality. You can chain them together to build complete voice solutions.
Not only can you generate Twimlet URLs, you can also save those URLs using what is essentially just a Twimlet URL shortening service. This allows you to refer to Twimlets in call flows by their Short URL, and later reconfigure the Twimlet without breaking anything.
Make calls from the Unix command line with this bash script, no webserver necessary (thanks to Twimlets!)
Send SMS messages from the Unix command line with this bash script